I've had a couple of old ones that just seemed to die in their sleep. On the topic of egg production, the quality and quantity will go down as they age past their prime. The eggs get larger but the shells get thinner. You can't necessarily count on having a good supply of eggs for 4-5 yrs. I have two birds that slowed down significantly at 3 yrs. I've rarely gotten an egg from them over the past 2 yrs.